You just said you were afraid it would show, and when noted that he didn't actually show this you changed gears and said that he showed it in his play over the last 4 years. lol - really?
You mean in the play of a guy who was thrust into the starting role unexpectedly and helped the team to a 13-3 record, or the play of a guy who will try and run through linebackers to get a first down, or the play of a guy who hangs in the pocket and takes hits while waiting for receivers to get open, or the play of a guy is regarded as a leader and someone always eager to work and learn?
You may not think he is a good enough QB for the team, but to suggest he doesn't put everything into playing for the Cowboys further shows you don't have any sense of fairmindedness about him.